private static PsiType handleBoundComposition(
PsiWildcardType wildcardType, PsiWildcardType bound) {
if (bound.isExtends() == wildcardType.isExtends()) {
final PsiType newBoundBound = bound.getBound();
if (newBoundBound != null) {
return PsiWildcardType.changeBound(wildcardType, newBoundBound);
}
}
return PsiWildcardType.createUnbounded(wildcardType.getManager());
}
@Override
public PsiType visitWildcardType(PsiWildcardType wildcardType) {
final PsiType bound = wildcardType.getBound();
if (bound == null) {
return wildcardType;
} else {
final PsiType newBound = bound.accept(this);
if (newBound == null) {
return null;
}
if (newBound instanceof PsiWildcardType) {
return handleBoundComposition(wildcardType, (PsiWildcardType) newBound);
}
if (newBound instanceof PsiCapturedWildcardType
&& wildcardType.isExtends()
!= ((PsiCapturedWildcardType) newBound).getWildcard().isExtends()) {
return handleBoundComposition(
wildcardType, ((PsiCapturedWildcardType) newBound).getWildcard());
}
return PsiWildcardType.changeBound(wildcardType, newBound);
}
}